I know that my interests are infuriatingly esoteric in nature, but that can't be helped. My brain is a beehive of useless information which isn't, I suppose, strictly useless, if it enriches your life in some way. For instance, this morning I was enthralled by this piece in the NY Times about author Vladimir Nabokov's interest in all things lepidoptrous. Most especially his specialty, the Polyommatus Blues, a gorgeous pale blue butterfly. It appears that a scientific theory which he held way back when in the 1970's (a theory that was scoffed at) has finally been vindicated.
I didn't know that the author of LOLITA and PALE FIRE and other literary classics was the Curator of Lepitoptera at the Museum of Comparative Zoology at Harvard University. Did you?